What would happen if Adele, counter-sued the RIAA.

Hello,

We constantly here stories of such organizations as the RIAA suing individuals for piracy. I am wondering what the outcome would be if hypothetically the RIAA were to file a lawsuit against an individual (person A) for the amount of $300,000 for seeding say Adele's latest album and in return Adele counter-sued the RIAA for filing a lawsuit against person A for $300,000? I would imagine that the RIAA would have no other option but to drop the lawsuit? It would be interesting to know if an artist such as Adele who has the financial means to do this could actually be able to do this?

Uhh well they're suing over someone's music because that person signed a contract allowing them to sue on their behalf, basically. So Adele wouldn't have much of a case... she signed with a label and accepted their contract.

At any rate is the RIAA even still doing new filesharing lawsuits? Last I'd heard they had stopped.